In the past, people have looked at photos as a record of memory. The focus has been on the past tense. With Instagram, the focus is on the present tense.

Videos are a very difficult medium to be good at and also a difficult medium to consume quickly.

Calling 'Instagram' a photo-sharing app is like calling a newspaper a letter-sharing book, or a Mozart grand era symphony a series of notes. 'Instagram' is less about the medium and more about the network.

Our goal is really to make sure that 'Instagram', whether you're a celebrity or not, is a safe place and that the content that gets posted is something that's appropriate for teens and also for adults.

The amazing thing about technology is that people have power. We are seeing it all the time in that innocuous people you would never know are having their voices heard because of this ability and technology we have.

On the Internet, inside information is currency, and there will always be counterfeiters among us.

The concern is over what will happen as strong encryption becomes commonplace with all digital communications and stored data. Right now the use of encryption isn't all that widespread, but that state of affairs is expected to change rapidly.

Apart from using it to spread the word about my translation company Blue Elephant and to talk to fans, I find social media an extremely powerful forum for charity.